gentle
Not necessarily, although they can be related. Unkind is the opposite of kind. This is to do with how you treat people. Gentle is the opposite of rough. This is to do with your actions in general.
Rough
Gentle.
the opposite of vicious is gentle / kind
The opposite could be gentle, or compassionate.
gentle, mild
Gentle, healthy, harmless, nonpoisonous, or lifegiving. Those words are the opposite of poisonous.
An opposite of powerful is weak. An opposite of generous is mean or miserly.
The words gentle or tender or compassionatemean the opposite of brutal.
Smooth is one opposite of wrinkly.Some other opposites are refined, gentle, flat and soft.
The opposite of strict can be lenient, flexible, or relaxed.